添加景区选择与合作订单流程并对齐 Android

suixinkan/Features/Home/ViewModels/ScenicSelectionViewModel.swift

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+//
+//  ScenicSelectionViewModel.swift
+//  suixinkan
+//
+
+import Foundation
+
+/// 权限申请审核中状态，对齐 Android role-apply pending status。
+enum PermissionApplyPendingStatus {
+    static let reviewing = 1
+    static let rejected = 3
+}
+
+/// 景区选择 ViewModel，对齐 Android `ScenicSelectionViewModel`。
+final class ScenicSelectionViewModel {
+
+    private(set) var spots: [ScenicSpotDisplayItem] = []
+    private(set) var searchQuery = ""
+    private(set) var currentLocationText = "最近的景区"
+    private(set) var isLoading = false
+
+    var onStateChange: (() -> Void)?
+    var onShowMessage: ((String) -> Void)?
+    var onSelectionComplete: (() -> Void)?
+    var onNavigateApply: (() -> Void)?
+    var onNavigateApplyStatus: ((String) -> Void)?
+
+    private let appStore: AppStore
+    private let locationProvider: HomeLocationProvider
+    private var currentLat: Double?
+    private var currentLng: Double?
+
+    init(appStore: AppStore = .shared, locationProvider: HomeLocationProvider = HomeLocationProvider()) {
+        self.appStore = appStore
+        self.locationProvider = locationProvider
+    }
+
+    func loadFromLocal() {
+        let scenicList = resolvedScenicList()
+        spots = ScenicSpotDisplayMapper.buildItems(
+            scenicList: scenicList,
+            searchQuery: searchQuery,
+            currentLat: currentLat,
+            currentLng: currentLng,
+            selectedScenicId: appStore.currentScenicId
+        )
+        notifyStateChange()
+    }
+
+    func onSearchQueryChange(_ query: String) {
+        searchQuery = query
+        loadFromLocal()
+    }
+
+    func startLocation() async {
+        isLoading = true
+        notifyStateChange()
+        do {
+            let snapshot = try await locationProvider.requestSnapshot()
+            currentLat = snapshot.latitude
+            currentLng = snapshot.longitude
+            let address = snapshot.address.trimmingCharacters(in: .whitespacesAndNewlines)
+            currentLocationText = address.isEmpty ? "最近的景区" : address
+            loadFromLocal()
+        } catch HomeLocationProviderError.permissionDenied {
+            onShowMessage?("未授予定位权限，无法获取附近景区")
+        } catch {
+            onShowMessage?("定位失败: \(error.localizedDescription)")
+        }
+        isLoading = false
+        notifyStateChange()
+    }
+
+    func selectSpot(_ spot: ScenicSpotDisplayItem) {
+        appStore.currentScenicId = spot.id
+        appStore.currentScenicName = spot.name
+        NotificationCenter.default.post(
+            name: NotificationName.scenicDidChange,
+            object: nil,
+            userInfo: [
+                NotificationUserInfoKey.scenicId: spot.id,
+                NotificationUserInfoKey.scenicName: spot.name,
+            ]
+        )
+        loadFromLocal()
+        onSelectionComplete?()
+    }
+
+    func onApplyNow(api: HomeAPI) async {
+        isLoading = true
+        notifyStateChange()
+        defer {
+            isLoading = false
+            notifyStateChange()
+        }
+        do {
+            let pendingList = try await api.roleApplyPending()
+            if let first = pendingList.first,
+               first.status == PermissionApplyPendingStatus.reviewing
+                || first.status == PermissionApplyPendingStatus.rejected {
+                onNavigateApplyStatus?(first.code)
+            } else {
+                onNavigateApply?()
+            }
+        } catch {
+            onNavigateApply?()
+        }
+    }
+
+    private func resolvedScenicList() -> [ScenicInfo] {
+        let cached = appStore.roleScenicList()
+        if !cached.isEmpty { return cached }
+        let rolePermissionList = appStore.rolePermissionList()
+        guard !rolePermissionList.isEmpty else { return [] }
+        return appStore.matchRolePermissionItem(in: rolePermissionList)?.scenic ?? []
+    }
+
+    private func notifyStateChange() {
+        onStateChange?()
+    }
+}